Cashfree PG Flutter SDK pub package

Integration Steps

Step 1: Add Dependency

Open the pubspec.yaml file located inside the app folder, and add cashfree_pg: under dependencies.

 cashfree_pg: 0.0.4+9

Step 2: Manifest Changes (Android)

The Cashfree PG SDK requires that you add the INTERNET permission in your Android Manifest file.

<manifest ...>
 <uses-permission android:name="android.permission.INTERNET" />
<application ...>

Set the tools:node attribute to merge in the definition of your application element in the Android Manifest file.

<application
        ...
        tools:node="merge">
          <!--Only add it if you need Auto OTP reading feature is enabled-->
        <meta-data android:name="com.google.android.gms.version"
          android:value="@integer/google_play_services_version" />
</application>

Step 3: Generate Token (From Backend)

You will need to generate a token from your backend and pass it to app while initiating payments. For generating token you need to use our token generation API. Please take care that this API is called only from your backend as it uses secretKey. Thus this API should never be called from App.

Request Description

For production/live usage set the action attribute of the form to: https://api.cashfree.com/api/v2/cftoken/order

For testing set the action attribute to: https://test.cashfree.com/api/v2/cftoken/order

You need to send orderId, orderCurrency and orderAmount as a JSON object to the API endpoint and in response a token will received. Please see the description of request below.

curl -XPOST -H 'Content-Type: application/json'
-H 'x-client-id: <YOUR_APP_ID>'
-H 'x-client-secret: <YOUR_SECRET_KEY>'
-d '{
 "orderId": "<ORDER_ID>",
 "orderAmount":<ORDER_AMOUNT>,
 "orderCurrency": "INR"
}' 'https://test.cashfree.com/api/v2/cftoken/order'

Request Example

Replace YOUR_APP_ID and YOUR_SECRET_KEY with actual values.

curl -XPOST -H 'Content-Type: application/json' -H 'x-client-id: YOUR_APP_ID' -H 'x-client-secret: YOUR_SECRET_KEY' -d '{
 "orderId": "Order0001",
 "orderAmount":1,
 "orderCurrency":"INR"
}' 'https://test.cashfree.com/api/v2/cftoken/order'

Response Example

{
"status": "OK",
"message": "Token generated",
"cftoken": "v79JCN4MzUIJiOicGbhJCLiQ1VKJiOiAXe0Jye.s79BTM0AjNwUDN1EjOiAHelJCLiIlTJJiOik3YuVmcyV3QyVGZy9mIsEjOiQnb19WbBJXZkJ3biwiIxADMwIXZkJ3TiojIklkclRmcvJye.K3NKICVS5DcEzXm2VQUO_ZagtWMIKKXzYOqPZ4x0r2P_N3-PRu2mowm-8UXoyqAgsG"
}

The "cftoken" is the token that is used authenticate your payment request that will be covered in the next step.

Step 4: Initiate Payment

  • App passes the order info and the token to the SDK
  • Customer is shown the payment screen where he completes the payment
  • Once the payment is complete SDK verifies the payment
  • App receives the response from SDK and handles it appropriately

NOTE

  • The order details passed during the token generation and the payment initiation should match. Otherwise you'll get a"invalid order details" error.
  • Wrong appId and token will result in "Unable to authenticate merchant" error. The token generated for payment is valid for 5 mins within which the payment has to be initiated. Otherwise you'll get a "Invalid token" error.

Payment modes

Web Checkout Integration

How to integrate

For both the modes (normal and seamless) you need to invoke the doPayment() method. However, there are a few extra parameters you need to pass incase of seamless mode.

doPayment

Future<Map<dynamic, dynamic>> doPayment(Map<String, dynamic> inputs)

Initiates the payment in a webview. The customer will be taken to the payment page on cashfree server where they will have the option of paying through any payment option that is activated on their account. Once the payment is done the webview will close and the response will be delivered in the callback.

Parameters:

  • params A map of all the relevant parameters described in the Request Params section below.

Sample Code


CashfreePGSDK.doPayment(inputParams)
        .then((value) => value?.forEach((key, value) {
              print("$key : $value");
              //Do something with the result
            }));

Request Parameters

ParameterRequiredDescription
color1YesBackground color value of the top bar as Hex String. ex:- "#FFFFFF"
color2YesText color of the topbar as Hex String. ex:- "#000000"
stageYesEnvironment - TEST or PROD
appIdYesYour app id
orderIdYesOrder/Invoice Id
orderAmountYesBill amount of the order
orderNoteNoA help text to make customers know more about the order
orderCurrencyYesCurrency code of the order. Default is INR.
customerNameNoName of the customer
customerPhoneYesPhone number of customer
customerEmailYesEmail id of the customer
tokenDataYesToken generated from step 4
notifyUrlNoNotification URL for server-server communication. Useful when user’s connection drops after completing payment.
paymentModesNoAllowed payment modes for this order. Available values: cc, dc, nb, paypal, upi, wallet. Leave it blank if you want to display all modes

Response parameters

These parameters are sent as extras to the onActivityResult(). They contain the details of the transaction.

ParameterDescription
orderIdOrder id for which transaction has been processed. Ex: GZ-212
orderAmountAmount of the order. Ex: 256.00
paymentModePayment mode of the transaction.
referenceIdCashfree generated unique transaction Id. Ex: 140388038803
txStatusPayment status for that order. Values can be : SUCCESS, FLAGGED, PENDING, FAILED, CANCELLED.
paymentModePayment mode used by customer to make the payment. Ex: DEBIT_CARD, MobiKwik, etc
txMsgMessage related to the transaction. Will have the reason, if payment failed
txTimeTime of the transaction
typeFixed value : CashFreeResponse. To identify the response is from cashfree SDK.
signatureResponse signature, more here.

NOTE

  • There can be scenarios where the SDK is not able to verify the payment within a short period of time. The status of such orders will be PENDING.
  • If the WebView is closing as soon as it opens then most probably something is wrong with the input passed to the SDK. Please check your inputs and if you still need further help reach out to us at techsupport@cashfree.com.
  • If you are getting INCOMPLETE as the transaction status please reach out to your account manager or techsupport@cashfree.com.

Libraries

cashfree_pg